磁気軸受で支持された弾性ロータの熱曲がり振動(機械力学,計測,自動制御)

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This paper describes a synchronous vibration instability problem that occurred on a two-stage overhung centrifugal compressor. The authors encountered an unbalance vibration that increased spirally in a polar plot at/near the first bending critical speed. An iron loss concentration and a thermal bend by heat have been identified as the cause of the phenomenon, because the vibration stops increasing, when an unbalance force rejection control (UFRC) is applied. Iron loss is generated intensively in a higher flux density part that produces larger magnetic force than the others. If an unbalance force is exerted on a shaft, iron loss is concentrated on a certain part of a rotating core and the core is deformed by heat, because the bearing reaction force to the unbalance force is stationary on the rotating core. In order to exceed the first bending critical speed stably, rotor balancing under UFRC and a rapid speed acceleration/deceleration are carried out. The vibration behaviors around the critical speed are measured and the results verify the instability mechanism induced by interaction between iron loss and unbalance vibration control. The mechanism is also modeled by using a transfer function and the stability limit depending on rotational speed is presented. The measurement method for the most important parameter |H/R| that determines the stability is proposed and some measured results are presented.
一般社団法人日本機械学会の論文
2006-11-25

磁気軸受で支持された弾性ロータの熱曲がり振動(機械力学,計測,自動制御)

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